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In page Livy:

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The topic of manuscript variants is a large and specialized one, on which authors of works on Livy seldom care to linger. As a result, standard information in a standard rendition is used, which gives the impression of a standard set of dates for Livy. There are no such dates.[citation needed] A typical presumption is of a birth in the 2nd year of the 180th Olympiad and a death in the first year of the 199th Olympiad, which are coded 180.2 and 199.1 respectively.[2] All sources use the same first Olympiad, 776/775–773/772 BC by the modern calendar. By a complex formula (made so by the 0 reference point not falling on the border of an Olympiad), these codes correspond to 59 BC for the birth, 17 AD for the death. In another manuscript the birth is in 180.4, or 57 BC.[3]